I'm writing to see what tools, if any, you guys use or prefer to use to monitor your *nix servers. Currently we are running two FOG servers where I work and would like to be kept in the loop in case of failures before it's really well known to others. We have 2 servers as of now, and may add more down the road. Basically, we'd like to monitor if any of the following fails: MySQL Apache NFS TFTP basically all of the core components to make FOG run. Any suggestions or software that you use/recommend to monitor these functions on the servers?